The British Army is, not unlike the U.S. Army, comprised of volunteers (rather than conscriptees). And like the U.S. Army, it has a website, in which interested individuals can take a look around and decide what career options may interest them.
Those interested in joining the Royal Guard will have to consider the infantry, according to Indeed UK, since such guardsmen are recruited from the ranks of that particular division. Of course, not everyone who enlists in the British Army infantry goes on to be a royal guard and could go on to other careers in that unit if they so choose (and were the right fit).
Of course, all British Army recruits (including those who would go into the Royal Guard) have to pass the same basic fitness test that all recruits do –- the British Army Recruit Battery (BARB) test, as it's called, according to HITC. Further still, the guards are on-duty for up to 48 hours at a time, are expected to stand perfectly still for lengthy periods of time — usually two-hour stints, but up to six-hour stretches occasionally — and wear their uniforms –- bearskin hats and all –- regardless of how hot it is, according to Insider. Fainting is so common for royal guards due to the rigors of standing still in their uniforms in the heat that there is even a prescribed protocol for how to faint properly. They learn to "faint to attention" per Today I Found Out, and it requires that they stiffen and fall forward on their faces.
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